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how to edit userChrome.css for firefox to look as if it was in fullscreen mode, but in a window?

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Basically, I want to remove toolbar, bookmark bar, tabbar, so that there is only the webpage and the window title. I would like to have this effect, so that I can make a website look like a PWA. How could I do this?

Thanks in advance

Basically, I want to remove toolbar, bookmark bar, tabbar, so that there is only the webpage and the window title. I would like to have this effect, so that I can make a website look like a PWA. How could I do this? Thanks in advance

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WARNING from the moderator team: userChrome.css scripts are not provided by Mozilla and is not officially supported. Firefox is a work in progress and, to allow for continuous innovation, Mozilla cannot guarantee future updates won’t impact your customizations. For this reason, Mozilla does not officially support style rules customization.

Please read Firefox Advanced Customization and Configuration Options to learn more.

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Maybe look at Kiosk mode.

See also the Firefox CSS subreddit forum.